Method for reducing indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio

A DCO-OFDM, peak-to-average power ratio technology, applied in the field of reducing the peak-to-average power ratio of an indoor visible light DCO-OFDM system, can solve the problem of low power utilization, reduce the peak-to-average power ratio and transmission reliability of an indoor visible light DCO-OFDM system Low problems, to achieve high power utilization, avoid discomfort to the human eye, and effectively improve the signal-to-noise ratio of reception

Inactive Publication Date: 2018-11-27
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for reducing the peak-to-average power ratio of the indoor visible light DCO-OFDM system, which solves the problems of low power utilization and low transmission reliability of the DCO-OFDM system existing in the prior art

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  • Method for reducing indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio
  • Method for reducing indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio
  • Method for reducing indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio

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[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] The method of the present invention reduces the peak-to-average power ratio of the indoor visible light DCO-OFDM system. The transmitting end converts the wideband subcarrier into multiple narrowband subcarriers through M filters; The broadband signal is restored.

[0038] The system realizing the method for reducing the indoor visible light DCO-OFDM system peak-to-average power ratio of the present invention includes a transmitting end, a transmission system and a receiving end (such as figure 2 shown);

[0039] The sending end includes a network camera 1, a video encoder 2, a QAM modulator 3, a shift register a4, and a DSP module a5 connected in sequence; the DSP module 5 is respectively connected to M filters 6; each filter a6 is sequentially modulated with OFDM Device 7, drive circuit 8, light source 9 are connected (such as i...

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Abstract

The invention discloses a method for reducing the indoor visible light DCO-OFDM (Orthogonal Frequency Division Multiplexing) system peak-to-average power ratio. A sending end changes wideband subcarriers into a plurality of narrow band sub carriers through M filters; a receiving end recovers the wideband signals through zero forcing detection, M filters and signal overlapping. The system has the advantages that the power utilization rate is high; the nonlinear distortion due to LED can be resisted; the system error rate is reduced; during communication, the indoor normal illumination can be maintained; the human eye uncomfortable feeling due to medium intensity flickering in a single light source system can be favorably avoided.

Description

technical field [0001] The invention belongs to the technical field of indoor visible light communication, and in particular relates to a method for reducing the peak-to-average power ratio of an indoor visible light DCO-OFDM system. Background technique [0002] Visible light communication (Visible Light Communication, VLC) refers to the use of light in the visible light band of 400-700nm as an information carrier, without the need for transmission media such as optical fibers, and directly transmits optical signals in the air. Compared with infrared, bluetooth, WI-FI and other radio frequency communication technologies, VLC has the following advantages: (1) it will not harm the safety of human eyes; (2) the spectrum resources are abundant, and no radio spectrum license is required; (3) the transmission High power; (4) not susceptible to electromagnetic interference; (5) green and environmentally friendly. Therefore, in the future, it has broad application prospects in the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B10/116
CPCH04B10/116H04L27/2614
Inventor 邓莉君高海涛许韦
Owner XIAN UNIV OF TECH
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